<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">

    <title>滑动切换的注册登录界面</title>
    <style>
        * {
            /* 初始化 */
            margin: 0;
            padding: 0;
        }

        body {
            /* 100%窗口高度 */
            height: 100vh;
            /* 弹性布局 水平+垂直居中 */
            display: flex;
            justify-content: center;
            align-items: center;
            /* 渐变背景 */
            background: linear-gradient(200deg, #f3e7e9, #e3eeff);
        }

        .container {
            background-color: #fff;
            width: 650px;
            height: 415px;
            /* 相对定位 */
            position: relative;
            border-radius: 5px;
            /* 阴影 */
            box-shadow: 5px 5px 5px rgba(0, 0, 0, 0.1);
        }

        .form-box {
            /* 绝对定位 */
            position: absolute;
            top: -10%;
            left: 5%;
            background-color: #d3b7d8;
            width: 320px;
            height: 500px;
            border-radius: 5px;
            box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
            /* 动画过渡 加速后减速 */
            transition: 0.5s ease-in-out;
            z-index: 2;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .register-box,
        .login-box {
            /* 弹性布局 垂直排列 */
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 100%;
        }

        .hidden {
            display: none;
            /* 动画过渡 */
            transition: 0.5s;
        }

        h1 {
            text-align: center;
            margin-bottom: 25px;
            /* 转大写 */
            text-transform: uppercase;
            color: #fff;
            /* 字间距 */
            letter-spacing: 5px;
        }

        input {
            background-color: transparent;
            width: 70%;
            color: #fff;
            border: none;
            /* 下边框样式 */
            border-bottom: 1px solid rgba(255, 255, 255, 0.4);
            padding: 10px 0;
            text-indent: 10px;
            margin: 8px 0;
            font-size: 14px;
            letter-spacing: 2px;
        }

        input::placeholder {
            color: #fff;
        }

        input:focus {
            color: #a262ad;
            outline: none;
            border-bottom: 1px solid #a262ad80;
            transition: 0.5s;
        }

        input:focus::placeholder {
            opacity: 0;
        }

        .form-box button {
            width: 70%;
            margin-top: 35px;
            background-color: #f6f6f6;
            outline: none;
            border-radius: 8px;
            padding: 13px;
            color: #a262ad;
            letter-spacing: 2px;
            border: none;
            cursor: pointer;
        }

        .form-box button:hover {
            background-color: #a262ad;
            color: #f6f6f6;
            transition: background-color 0.5s ease;
        }

        .con-box {
            width: 50%;
            /* 弹性布局 垂直排列 居中 */
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            /* 绝对定位 居中 */
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
        }

        .con-box.left {
            left: -2%;
        }

        .con-box.right {
            right: -2%;
        }

        .con-box h2 {
            color: #8e9aaf;
            font-size: 25px;
            font-weight: bold;
            letter-spacing: 3px;
            text-align: center;
            margin-bottom: 4px;
        }

        .con-box p {
            font-size: 12px;
            letter-spacing: 2px;
            color: #8e9aaf;
            text-align: center;
        }

        .con-box span {
            color: #d3b7d8;
        }

        .con-box img {
            width: 150px;
            height: 150px;
            opacity: 0.9;
            margin: 40px 0;
        }

        .con-box button {
            margin-top: 3%;
            background-color: #fff;
            color: #a262ad;
            border: 1px solid #d3b7d8;
            padding: 6px 10px;
            border-radius: 5px;
            letter-spacing: 1px;
            outline: none;
            cursor: pointer;
        }

        .con-box button:hover {
            background-color: #d3b7d8;
            color: #fff;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="form-box">
            <!-- 注册 -->
            <div class="register-box hidden">
                <h1>register</h1>
                <input type="text" placeholder="用户名">
                <input type="email" placeholder="邮箱">
                <input type="password" placeholder="密码">
                <input type="password" placeholder="确认密码">
                <button>注册</button>
            </div>
            <!-- 登录 -->
            <div class="login-box">
                <h1>login</h1>
                <input type="text" placeholder="用户名">
                <input type="password" placeholder="密码">
                <button>登录</button>
            </div>
        </div>
        <div class="con-box left">
            <h2 class="title">欢迎来到<span>宠物之家</span></h2>
            <p>快来领取你的专属<span>宠物</span>吧</p>
            <img src="https://picsum.photos/1920/1080?1" alt="" class="smaller">
            <p>已有账号</p>
            <button id="login">去登录</button>
        </div>
        <div class="con-box right">
            <h2 class="title">欢迎来到<span>宠物之家</span></h2>
            <p>快来看看你的可爱<span>宠物</span>吧</p>
            <img src="https://picsum.photos/1920/1080?2" alt="" class="smaller">
            <p>没有账号？</p>
            <button id="register">去注册</button>
        </div>
    </div>
    <script>
        // 要操作到的元素
        let login = document.getElementById('login');
        let register = document.getElementById('register');
        let form_box = document.getElementsByClassName('form-box')[0];
        let register_box = document.getElementsByClassName('register-box')[0];
        let login_box = document.getElementsByClassName('login-box')[0];
        // 去注册按钮点击事件
        register.addEventListener('click', () => {
            form_box.style.transform = 'translateX(80%)';
            login_box.classList.add('hidden');
            register_box.classList.remove('hidden');
        })
        // 去登录按钮点击事件
        login.addEventListener('click', () => {
            form_box.style.transform = 'translateX(0%)';
            register_box.classList.add('hidden');
            login_box.classList.remove('hidden');
        })
    </script>
</body>

</html>